Campaigners fear assisted suicide is being legalised by the back door as record numbers of Britons end their lives at Dignitas – while their relatives escape investigation for helping them. The Swiss suicide clinic helped 33 people from this country to die last year – the highest ever annual figure – pushing the total during the past decade close to 250. But police passed only a handful of files to prosecutors over the assistance provided by loved ones, and no one was charged. A police worker even accompanied her mother to Switzerland but faced no sanction. The Association of Chief Police Officers (ACPO) has recently issued new guidelines to every force in the country about how they should investigate assisted suicides. Although the document is restricted, this newspaper has been shown the section that deals with deaths abroad. It highlights how tough such inquiries can be because of the difficulty in obtaining evidence from foreign authorities.